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= 1/2 . (5x+3) . (2x-2)
= 1/2 2.(x-1)(5x+3)
= (x-1)(5x+3)
= 5x² - 5x +3x - 3
= 5x² - 2x - 3
L = (5x + 3)(2x - 2) / 2
L = 10x² - 10x + 6x - 6 / 2
L = 10x² - 4x - 6 / 2
L = 2(5x² - 2x - 3)/2
L = 5x² - 2x - 3 cm²